C++ Method to convert from Time t to String.

stringTotime.cpp

#include <stdlib.h> // for std::rand
#include <iomanip>
#include <time.h>
#include <stdio.h>
#include <ctime>
#include <string>
#include <sstream>
#include <iostream>
using namespace std;

int main(int argc, char const *argv[])
{
string  time, tm_year, tm_mday, tm_mon, tm_hour, tm_min, tm_sec;
  time= "20172203122023";
struct tm tm;
   tm_year = time.substr(0,4);
   tm_mday = time.substr(4,2);
   tm_mon = time.substr(6,2);
   tm_hour = time.substr(8,2);
   tm_min = time.substr(10,2);
   tm_sec = time.substr(12,2);

   // insert the value to tm struct
   tm.tm_year = stoi(tm_year) - 1900;
   tm.tm_mon = stoi(tm_mon) -1;
   tm.tm_mday = stoi(tm_mday);
   tm.tm_min = stoi(tm_min);
   tm.tm_hour = stoi(tm_hour);
   tm.tm_sec = stoi(tm_sec);
   tm.tm_isdst = -1;

   cout <<"Year:" << tm.tm_year + 1900 << "\nMonth:" << tm.tm_mon + 1<< endl;
   cout <<"Day:" << tm.tm_mday << "\nHour:" << tm.tm_hour<< endl;
   cout <<"Min:" << tm.tm_min << "\nSecond:"<< tm.tm_sec<<endl;

    time_t tStart = mktime(&tm);
    char buff[20];
    char buff1[20];
    //time_t now = time(NULL);
    strftime(buff, 20, "%Y/%m/%d %H:%M", localtime(&tStart));
    strftime(buff1, 20, "%Y%m%d", localtime(&tStart));
    puts(buff);
    puts(buff1);

return 0;
}